Windows installation error create temp folder

[sudharsan 123]

i am installing from hard drive .it worked for me 2 months back when i installed trial version of windows 7 .but now it doesn't .i have repeatedly tried but it says the same cannot create a temp folder

 

[fatsauce]

have your altered your computer in anyway..like new hardware???

 

[sudharsan 123]

have your altered your computer in anyway..like new hardware???

after i installed and deleted w7 trial version i once installed windows vista and there was a problem stating that boot manager was compressed and i had to even reinstall my windows xp for that . except for that i didn't find any changes or problems .